Organic Chemistry MCQs

Organic Chemistry MCQs

Try to answer these Organic Chemistry MCQs and check your understanding of the Organic Chemistry subject. Scroll down and let's begin!

1: A carbon atom with four single bonds will be ____________hybridized.

A.   Sp2

B.   Lone pair

C.   Sp3

D.   Sp

2: A saturated hydrocarbon is an organic compound which contains hydrogen and carbon joined _____.

A.   The boiling points

B.   With single bonds

C.   A double bond between carbon atoms

D.   Octane

3: A secondary alcohol has a hydroxyl group bonded to a(n) ________.

A.   Ketones

B.   Carbon bonded to three alkyl groups

C.   Skunky or bad smelling odors

D.   Carbon bonded to two alkyl groups

4: Dopamine,c8h11no2, has ____________ degrees of unsaturation.

A.   4

B.   3

C.   2

D.   1

5: Enantiomers are __________.

A.   Mirror-image isomers of a molecule

B.   Hydrophobic, non polar, and good source of stored energy

C.   Cis - trans isomers

D.   May not be equally effective

6: Enantiomers are molecules that _____.

A.   Contain an -OH group

B.   Are mirror images

C.   Differ in the arrangement of their molecules about a double bond

D.   Contain a carboxyl group

E.   Are isomers that differ in the covalent partnerships between their atoms

7: Of the bonds below, ________ is the least polar.

A.   C–C

B.   C–N

C.   C–Cl

D.   C–F

E.   C–O

8: Stanley miller's experiments were significant because he demonstrated that __________.

A.   The behavior of any molecule containing a carbon atom was fundamentally the same

B.   Under certain circumstances the theory of vitalism was valid

C.   A large variety of organic compounds could be spontaneously synthesized from components in Earth's primitive atmosphere

D.   Lightning discharges could produce the molecules previously presumed to have originated in volcanic outgassings

E.   Urea could be synthesized from entirely naturally occurring salts

9: A gas under constant pressure will ____________ when ____________.

A.   Contract; heated

B.   Expand; cooled

C.   Expand; heated

D.   Keep the same volume when heated or cooled

10: 1-methylcyclopentanol is classified as ________.

A.   A primary alcohol

B.   A secondary alcohol

C.   A tertiary alcohol

D.   A phenol

E.   An enol

11: The ionized or dissociated carboxyl group may be written as __________.

A.   -O -

B.   -COO -

C.   -NH4 -

D.   -C=O

12: A mole of yellow photons of wavelength 527 nm has ________ kj of energy.

A.   227

B.   123

C.   223

D.   226

13: The carbon-carbon triple bond of an alkyne is composed of ________.

A.   Three σ bonds

B.   Three π bonds

C.   Two σ bonds and one π bond

D.   One σ bond and two π bonds

14: A cycloalkane ________.

A.   Has two fewer carbon atoms than the corresponding alkane

B.   Has two fewer hydrogen atoms than the corresponding alkane

C.   Contains - CH3 groups joined by single bonds

D.   Always contains a three carbon ring

15: The chemical group that helps stabilize protein structure is the __________.

A.   Sulfhydryl group (-SH)

B.   Take place in nuclear reactors

C.   Are always fusion reactions

D.   Never produce radioactive by-products

16: The carbon skeleton can vary in all of the following except __________.

A.   Lack of H atoms

B.   Orbital

C.   Bohr orbit

D.   Atomic Orbit

17: In an ethane (c2h6) molecule, each carbon atom is bonded to ________ hydrogen atoms.

A.   Three

B.   Two

C.   Four

D.   Five

18: Choline is a quaternary ammonium compound with a __________ charge on the nitrogen.

A.   Positive

B.   Negative

C.   Zero

D.   Neutral

19: Typically, amides will hydrolyze under ________ conditions than esters.

A.   Less vigorous

B.   More dilute

C.   More saline

D.   Stronger

20: An atom with z = 26 and a = 58 contains ________ protons and ________ neutrons.

A.   26; 58.

B.   58; 26.

C.   26; 32.

D.   32; 26.

21: The delocalized system in benzene is formed by a cyclic overlap of 6 ________ orbitals.

A.   S

B.   P

C.   Sp

D.   Sp2

E.   Sp3

22: The carbon atom is tetravalent, which means that __________.

A.   Carbon readily forms ionic bonds

B.   Carbon's first electron shell holds 4 electrons

C.   A carbon atom can complete its valence shell by forming four covalent bonds

D.   The bond angle between each bond is 90°, forming an arrangement like the points on a compass

E.   Carbon has a total of 4 electrons

23: The complexity and variety of organic molecules is due to _____.

A.   The chemical versatility of carbon atoms

B.   The variety of rare elements in organic molecules

C.   The diverse bonding patterns of nitrogen

D.   Their interaction with water

24: The most important way to classify organic compounds is by _____.

A.   The number of carbon atoms in the longest chain

B.   Functional group

C.   The type of carbon—carbon bonds

D.   Reactivity

25: The functional groups shown are the _______ group, the _______ group, and the _______ group.

A.   Amino

B.   Carboxyl

C.   Carboxyl and amino groups

D.   Carbon

26: Organic molecules with only hydrogens and five carbon atoms cannot _____.

A.   Form enantiomers.

B.   Carboxyl and amino groups

C.   Carboxyl

D.   Hydroxyl

27: Stanley miller's 1953 experiments supported the hypothesis that _____.

A.   Can form a variety of carbon skeletons and host functional groups

B.   Organic molecules can be synthesized abiotically under conditions that may have existed on early Earth

C.   Simple organic compounds, amino acids, and hydrocarbons

D.   The presence or absence of double bonds between the carbon atom and other atoms

28: The chemical group that is involved in regulating dna is the __________.

A.   Water (H2O)

B.   Methyl group (-CH3)

C.   Carbon

D.   COOH and -NH2

29: Biologically important chemical groups include all of the following except __________.

A.   Acid, amino

B.   Called hydrocarbons

C.   Lack of H atoms

D.   Water (H2O)

30: Chemical groups are significant because __________.

A.   They contribute to the molecular shape of a molecule and its unique properties

B.   Abiotic compounds cycled through the apparatus and were sampled for organic compounds

C.   The same molecular formula but different covalent arrangements of heir carbon skeletons

D.   A carbon atom can complete its valence shell by forming four covalent bonds

31: Geometric isomers are molecules that _____.

A.   Are isomers in which one of the molecules contains an amino group and the other contains a phosphate group

B.   Differ in their molecular formulas

C.   Differ in the arrangement of their atoms about a double bond

D.   Are isomers that differ in the covalent partnerships between their atoms

E.   Are mirror images

32: All chemical activities can be viewed as a series of ____________ between molecules.

A.   Chemical reactions

B.   Chemical reproduction

C.   Chemical bonding

D.   None of these